deadhead
The company pays to fly you over and back pre and post trip. You don't reside there for the 3 months. As for being junior - senior, I don't know, hopefully an Airbus guy will respond to that one.
I'm not sure at what you are getting at, but you are not forced into any of these things you were mentioning. Overseas is voluntary. The beauty of Fed Ex is that there is a wide variety of things to do and everyone wants something different.
Goose17